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Operating expenses - Interconnection costs and other telecommunication charges (Details) - ARS ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating expenses |  |  |
Operating expenses | $ 53,207 | $ 45,480 | $ 34,311
Fixed telephony interconnection costs | (486) | (445) | (327)
Cost of international outbound calls | (272) | (268) | (192)
Lease of circuits and use of public network | (490) | (461) | (336)
Mobile Services - charges for roaming | (348) | (414) | (374)
Mobile Services - charges for TLRD | (1,552) | (965) | (941)
Total interconnection costs and other telecommunication charges | $ (3,148) | $ (2,553) | $ (2,170)

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- Definition The amount of expense arising from communication. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of all operating expenses. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_85&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_OperatingExpense
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition The amount of expense arising from roaming charges. + References No definition available. + Details
Name: | teo_CommunicationExpenseChargesForRoaming
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of expense arising from termination charges from third parties' wireless networks. + References No definition available. + Details
Name: | teo_CommunicationExpenseChargesForTermination
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of expense arising from international outbound calls. + References No definition available. + Details
Name: | teo_CommunicationExpenseCostOfInternationalOutboundCalls
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of expense arising from fixed telephony interconnection costs. + References No definition available. + Details
Name: | teo_CommunicationExpenseFixedTelephonyInterconnectionCosts
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of expense arising from lease of circuits and use of public network. + References No definition available. + Details
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Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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